RiverFish

Perch · Perca fluviatilis

Perch in the Stort Navigation

Largest measured perch: 40.6 cm

The largest perch measured in Environment Agency surveys of the Stort Navigation was 40.6 cm, recorded at u/s Hunsdon Mill Lock on 9 September 2025.

Across 64 measured perch, the median measured length was 13.1 cm.

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the Stort Navigation.

See perch records across England →

Most recent observation9 September 2025u/s Hunsdon Mill Lock · 9 fish
Largest measured perch
40.6 cm
Median length
13.1 cm
Fish measured
64
Survey locations
7

Individual EA measurements

Largest measured perch

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

LengthSurvey dateSurvey locationSurvey ID
40.6 cm9 Sept 2025u/s Hunsdon Mill Lock178395
40 cm21 Aug 2025Sheering Mill Lock CPUE178037
37.6 cm21 Aug 2025Sheering Mill Lock CPUE178037
37.5 cm10 Jun 2011Hunsdon Mill House126580
37.2 cm10 Jun 2011Hunsdon Mill House126580
36.8 cm10 Jun 2011Hunsdon Mill House126580
35 cm18 Apr 2011Upstream Sheering Mill Lock126110
33.2 cm19 Apr 2011Downstream Sheering Mill Lock126121
25.2 cm21 Aug 2025Sheering Mill Lock CPUE178037
24.5 cm21 Apr 2011Upstream Kecksy's Bridge126133

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where perch were found

Each point marks a survey location with at least one perch record.

Choose a point on the map to see what was recorded there.

Map points are approximate and don’t show fishing access. Check local permissions before visiting.

Place surveyedFirst recordedLast recordedVisits finding perch
u/s Hunsdon Mill Lock9 Sept 20259 Sept 20251
Sheering Mill Lock CPUE21 Aug 202521 Aug 20251
Hunsdon Mill House10 Jun 201110 Jun 20111
Upstream Kecksy's Bridge21 Apr 201121 Apr 20111
Downstream Sheering Mill Lock19 Apr 201119 Apr 20111
Upstream Sheering Mill Lock - Sawbridgeworth Lock18 Apr 201118 Apr 20111
Upstream Sheering Mill Lock18 Apr 201118 Apr 20111

Choose a point or table row to see the location. More survey visits can mean more records, but not necessarily more fish.

2011–2025

Survey records by year

Each bar shows how many survey visits recorded perch that year.

Fish measured by surveyors

Measured length distribution

See how the 64 measured fish were spread across different length ranges.

Smallest
5.7 cm
Lower quarter
10.8 cm
Median
13.1 cm
Upper quarter
18.4 cm
Largest
40.6 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Stort Navigation

Compare other species with enough survey and measurement data for a detailed page.

Pike Roach Bleak Common bream Gudgeon Tench

Before you fish

Good to know

These are past survey records, so the fish present today may be different. Map points are approximate—check local access, permissions and fishing rules before visiting.

Learn how RiverFish uses the data →